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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = 'e3b04587950f3f7cb35ef86e176ae1e1e2bb85b548123c8d12b4e64da4c7bc6e' 
  AND token = 'HkG0Zerd9a4s2+tTVAZvvUEIbYVoCUAjjnMXSoNC5jE=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00031

JSON explain

{
  "query_block": {
    "select_id": 1,
    "table": {
      "message": "Impossible WHERE noticed after reading const tables"
    }
  }
}